/***************************************************************************/
/*                                                                         */
/*  aflatin2.c                                                             */
/*                                                                         */
/*    Auto-fitter hinting routines for latin script (body).                */
/*                                                                         */
/*  Copyright 2003-2012 by                                                 */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#include FT_ADVANCES_H

#include "aflatin.h"
#include "aflatin2.h"
#include "aferrors.h"


#ifdef AF_CONFIG_OPTION_USE_WARPER
#include "afwarp.h"
#endif


/*************************************************************************/
/*                                                                       */
/* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
/* messages during execution.                                            */
/*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_aflatin2


FT_LOCAL_DEF( FT_Error )

af_latin2_hints_compute_segments( AF_GlyphHints

hints,

AF_Dimension dim

);

FT_LOCAL_DEF( void )

af_latin2_hints_link_segments( AF_GlyphHints

hints,

AF_Dimension dim

);

/*************************************************************************/
/*************************************************************************/
/*****                                                               *****/
/*****            L A T I N   G L O B A L   M E T R I C S            *****/
/*****                                                               *****/
/*************************************************************************/
/*************************************************************************/

FT_LOCAL_DEF( void )

af_latin2_metrics_init_widths( AF_LatinMetrics

metrics,

FT_Face face,
        FT_ULong

charcode )
{
/* scan the array of segments in each direction */
AF_GlyphHintsRec hints[1];


af_glyph_hints_init( hints, face

->memory );

metrics->axis[AF_DIMENSION_HORZ].

width_count = 0;

metrics->axis[AF_DIMENSION_VERT].

width_count = 0;

{
FT_Error error;

FT_UInt glyph_index;

int dim;

AF_LatinMetricsRec dummy[1];

AF_Scaler scaler = &dummy->root.scaler;


glyph_index = FT_Get_Char_Index( face, charcode );

if ( glyph_index == 0 )
goto

Exit;

error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );

if ( error || face->glyph->outline.n_points <= 0 )
goto

Exit;

FT_ZERO( dummy );

dummy->

units_per_em = metrics->units_per_em;

scaler->

x_scale = scaler->y_scale = 0x10000L;

scaler->

x_delta = scaler->y_delta = 0;

scaler->

face = face;

scaler->

render_mode = FT_RENDER_MODE_NORMAL;

scaler->

flags = 0;

af_glyph_hints_rescale( hints, (AF_ScriptMetrics)

dummy );

error = af_glyph_hints_reload( hints, &face->glyph->outline );

if ( error )
goto

Exit;

for (

dim = 0;

dim <AF_DIMENSION_MAX;

dim++ )
{
AF_LatinAxis axis = &metrics->axis[ dim ];

AF_AxisHints axhints = &hints->axis[ dim ];

AF_Segment seg, limit, link;

FT_UInt num_widths = 0;


error = af_latin2_hints_compute_segments( hints,
                                          ( AF_Dimension ) dim );

if ( error )
goto

Exit;

af_latin2_hints_link_segments( hints,
(AF_Dimension)

dim );

seg = axhints->segments;

limit = seg + axhints->num_segments;

for (;

seg <limit;

seg++ )
{
link = seg->link;

/* we only consider stem segments there! */
if ( link && link->link == seg && link > seg )
{
FT_Pos dist;


dist = seg->pos - link->pos;

if ( dist < 0 )

dist = -dist;

if ( num_widths < AF_LATIN_MAX_WIDTHS )
axis->widths[num_widths++].

org = dist;

}
}

af_sort_widths( num_widths, axis

->widths );
axis->

width_count = num_widths;

}

Exit:
for (

dim = 0;

dim <AF_DIMENSION_MAX;

dim++ )
{
AF_LatinAxis axis = &metrics->axis[ dim ];

FT_Pos stdw;


stdw = ( axis->width_count > 0 )
       ? axis->widths[ 0 ].org
       : AF_LATIN_CONSTANT( metrics, 50 );

/* let's try 20% of the smallest width */
axis->

edge_distance_threshold = stdw / 5;

axis->

standard_width = stdw;

axis->

extra_light = 0;

}
}

af_glyph_hints_done( hints );

}


#define AF_LATIN_MAX_TEST_CHARACTERS  12


static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES]
[AF_LATIN_MAX_TEST_CHARACTERS + 1] =
        {
                "THEZOCQS",
                "HEZLOCUS",
                "fijkdbh",
                "xzroesc",
                "xzroesc",
                "pqgjy"
        };


static void
af_latin2_metrics_init_blues( AF_LatinMetrics metrics,
                              FT_Face face )
{
    FT_Pos flats[AF_LATIN_MAX_TEST_CHARACTERS];
    FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS];
    FT_Int num_flats;
    FT_Int num_rounds;
    FT_Int bb;
    AF_LatinBlue blue;
    FT_Error error;
    AF_LatinAxis axis = &metrics->axis[ AF_DIMENSION_VERT ];
    FT_GlyphSlot glyph = face->glyph;


    /* we compute the blues simply by loading each character from the     */
    /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */
    /* bottom-most points (depending on `AF_IS_TOP_BLUE')                 */

    FT_TRACE5(( "blue zones computation\n" ));
    FT_TRACE5(( "------------------------------------------------\n" ));

    for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
    {
        const char *p = af_latin2_blue_chars[ bb ];
        const char *limit = p + AF_LATIN_MAX_TEST_CHARACTERS;
        FT_Pos * blue_ref;
        FT_Pos * blue_shoot;


        FT_TRACE5(( "blue %3d: ", bb ));

        num_flats = 0;
        num_rounds = 0;

        for ( ; p < limit && *p; p++ )
        {
            FT_UInt glyph_index;
            FT_Int best_point, best_y, best_first, best_last;
            FT_Vector *points;
            FT_Bool round;


            FT_TRACE5(( "'%c'", *p ));

            /* load the character in the face -- skip unknown or empty ones */
            glyph_index = FT_Get_Char_Index( face, ( FT_UInt ) * p );
            if ( glyph_index == 0 )
            {
                continue;
            }

            error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
            if ( error || glyph->outline.n_points <= 0 )
            {
                continue;
            }

            /* now compute min or max point indices and coordinates */
            points = glyph->outline.points;
            best_point = -1;
            best_y = 0;  /* make compiler happy */
            best_first = 0;  /* ditto */
            best_last = 0;  /* ditto */

            {
                FT_Int nn;
                FT_Int first = 0;
                FT_Int last = -1;


                for ( nn = 0; nn < glyph->outline.n_contours; first = last + 1, nn++ )
                {
                    FT_Int old_best_point = best_point;
                    FT_Int pp;


                    last = glyph->outline.contours[ nn ];

                    /* Avoid single-point contours since they are never rasterized. */
                    /* In some fonts, they correspond to mark attachment points     */
                    /* which are way outside of the glyph's real outline.           */
                    if ( last == first )
                    {
                        continue;
                    }

                    if ( AF_LATIN_IS_TOP_BLUE( bb ))
                    {
                        for ( pp = first; pp <= last; pp++ )
                        {
                            if ( best_point < 0 || points[ pp ].y > best_y )
                            {
                                best_point = pp;
                                best_y = points[ pp ].y;
                            }
                        }
                    }
                    else
                    {
                        for ( pp = first; pp <= last; pp++ )
                        {
                            if ( best_point < 0 || points[ pp ].y < best_y )
                            {
                                best_point = pp;
                                best_y = points[ pp ].y;
                            }
                        }
                    }

                    if ( best_point != old_best_point )
                    {
                        best_first = first;
                        best_last = last;
                    }
                }
                FT_TRACE5(( "%5d", best_y ));
            }

            /* now check whether the point belongs to a straight or round   */
            /* segment; we first need to find in which contour the extremum */
            /* lies, then inspect its previous and next points              */
            {
                FT_Int start, end, prev, next;
                FT_Pos dist;


                /* now look for the previous and next points that are not on the */
                /* same Y coordinate.  Threshold the `closeness'...              */
                start = end = best_point;

                do
                {
                    prev = start - 1;
                    if ( prev < best_first )
                    {
                        prev = best_last;
                    }

                    dist = points[ prev ].y - best_y;
                    if ( dist < -5 || dist > 5 )
                    {
                        break;
                    }

                    start = prev;

                }
                while ( start != best_point );

                do
                {
                    next = end + 1;
                    if ( next > best_last )
                    {
                        next = best_first;
                    }

                    dist = points[ next ].y - best_y;
                    if ( dist < -5 || dist > 5 )
                    {
                        break;
                    }

                    end = next;

                }
                while ( end != best_point );

                /* now, set the `round' flag depending on the segment's kind */
                round = FT_BOOL(
                        FT_CURVE_TAG( glyph->outline.tags[ start ] ) != FT_CURVE_TAG_ON ||
                        FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON );

                FT_TRACE5(( "%c ", round ? 'r' : 'f' ));
            }

            if ( round )
            {
                rounds[ num_rounds++ ] = best_y;
            }
            else
            {
                flats[ num_flats++ ] = best_y;
            }
        }

        FT_TRACE5(( "\n" ));

        if ( num_flats == 0 && num_rounds == 0 )
        {
            /*
             *  we couldn't find a single glyph to compute this blue zone,
             *  we will simply ignore it then
             */
            FT_TRACE5(( "empty\n" ));
            continue;
        }

        /* we have computed the contents of the `rounds' and `flats' tables, */
        /* now determine the reference and overshoot position of the blue -- */
        /* we simply take the median value after a simple sort               */
        af_sort_pos( num_rounds, rounds );
        af_sort_pos( num_flats, flats );

        blue = &axis->blues[ axis->blue_count ];
        blue_ref = &blue->ref.org;
        blue_shoot = &blue->shoot.org;

        axis->blue_count++;

        if ( num_flats == 0 )
        {
            *blue_ref =
            *blue_shoot = rounds[ num_rounds / 2 ];
        }
        else if ( num_rounds == 0 )
        {
            *blue_ref =
            *blue_shoot = flats[ num_flats / 2 ];
        }
        else
        {
            *blue_ref = flats[ num_flats / 2 ];
            *blue_shoot = rounds[ num_rounds / 2 ];
        }

        /* there are sometimes problems: if the overshoot position of top     */
        /* zones is under its reference position, or the opposite for bottom  */
        /* zones.  We must thus check everything there and correct the errors */
        if ( *blue_shoot != *blue_ref )
        {
            FT_Pos ref = *blue_ref;
            FT_Pos shoot = *blue_shoot;
            FT_Bool over_ref = FT_BOOL( shoot > ref );


            if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )
            {
                *blue_shoot = *blue_ref = ( shoot + ref ) / 2;
            }
        }

        blue->flags = 0;
        if ( AF_LATIN_IS_TOP_BLUE( bb ))
        {
            blue->flags |= AF_LATIN_BLUE_TOP;
        }

        /*
         * The following flags is used later to adjust the y and x scales
         * in order to optimize the pixel grid alignment of the top of small
         * letters.
         */
        if ( bb == AF_LATIN_BLUE_SMALL_TOP )
        {
            blue->flags |= AF_LATIN_BLUE_ADJUSTMENT;
        }

        FT_TRACE5(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot ));
    }

    return;
}


FT_LOCAL_DEF( void )

af_latin2_metrics_check_digits( AF_LatinMetrics

metrics,

FT_Face face

)
{
FT_UInt i;

FT_Bool started = 0, same_width = 1;

FT_Fixed advance, old_advance = 0;


/* check whether all ASCII digits have the same advance width; */
/* digit `0' is 0x30 in all supported charmaps                 */
for (

i = 0x30;

i <= 0x39; i++ )
{
FT_UInt glyph_index;


glyph_index = FT_Get_Char_Index( face, i );

if ( glyph_index == 0 )
continue;

if (

FT_Get_Advance( face, glyph_index,
        FT_LOAD_NO_SCALE

|
FT_LOAD_NO_HINTING       |
FT_LOAD_IGNORE_TRANSFORM,
&advance ))
continue;

if ( started )
{
if ( advance != old_advance )
{
same_width = 0;

break;
}
}
else
{
old_advance = advance;

started = 1;

}
}

metrics->root.

digits_have_same_width = same_width;

}


FT_LOCAL_DEF( FT_Error )

af_latin2_metrics_init( AF_LatinMetrics

metrics,

FT_Face face

)
{
FT_Error error = AF_Err_Ok;

FT_CharMap oldmap = face->charmap;

FT_UInt ee;

static const FT_Encoding latin_encodings[] =
        {
                FT_ENCODING_UNICODE,
                FT_ENCODING_APPLE_ROMAN,
                FT_ENCODING_ADOBE_STANDARD,
                FT_ENCODING_ADOBE_LATIN_1,
                FT_ENCODING_NONE  /* end of list */
        };


metrics->

units_per_em = face->units_per_EM;

/* do we have a latin charmap in there? */
for (

ee = 0;

latin_encodings[ee] !=

FT_ENCODING_NONE;

ee++ )
{
error = FT_Select_Charmap( face, latin_encodings[ ee ] );

if ( !error )
break;
}

if ( !error )
{
/* For now, compute the standard width and height from the `o'. */
af_latin2_metrics_init_widths( metrics, face,

'o' );

af_latin2_metrics_init_blues( metrics, face

);

af_latin2_metrics_check_digits( metrics, face

);
}

FT_Set_Charmap( face, oldmap

);
return

AF_Err_Ok;

}


static void
af_latin2_metrics_scale_dim( AF_LatinMetrics metrics,
                             AF_Scaler scaler,
                             AF_Dimension dim )
{
    FT_Fixed scale;
    FT_Pos delta;
    AF_LatinAxis axis;
    FT_UInt nn;


    if ( dim == AF_DIMENSION_HORZ )
    {
        scale = scaler->x_scale;
        delta = scaler->x_delta;
    }
    else
    {
        scale = scaler->y_scale;
        delta = scaler->y_delta;
    }

    axis = &metrics->axis[ dim ];

    if ( axis->org_scale == scale && axis->org_delta == delta )
    {
        return;
    }

    axis->org_scale = scale;
    axis->org_delta = delta;

    /*
     * correct Y scale to optimize the alignment of the top of small
     * letters to the pixel grid
     */
    if ( dim == AF_DIMENSION_VERT )
    {
        AF_LatinAxis vaxis = &metrics->axis[ AF_DIMENSION_VERT ];
        AF_LatinBlue blue = NULL;


        for ( nn = 0; nn < vaxis->blue_count; nn++ )
        {
            if ( vaxis->blues[ nn ].flags & AF_LATIN_BLUE_ADJUSTMENT )
            {
                blue = &vaxis->blues[ nn ];
                break;
            }
        }

        if ( blue )
        {
            FT_Pos scaled = FT_MulFix( blue->shoot.org, scaler->y_scale );
            FT_Pos fitted = ( scaled + 40 ) & ~63;

#if 1
            if ( scaled != fitted )
            {
                scale = FT_MulDiv( scale, fitted, scaled );
                FT_TRACE5(( "== scaled x-top = %.2g"
                            "  fitted = %.2g, scaling = %.4g\n",
                        scaled / 64.0, fitted / 64.0,
                        ( fitted * 1.0 ) / scaled ));
            }
#endif
        }
    }

    axis->scale = scale;
    axis->delta = delta;

    if ( dim == AF_DIMENSION_HORZ )
    {
        metrics->root.scaler.x_scale = scale;
        metrics->root.scaler.x_delta = delta;
    }
    else
    {
        metrics->root.scaler.y_scale = scale;
        metrics->root.scaler.y_delta = delta;
    }

    /* scale the standard widths */
    for ( nn = 0; nn < axis->width_count; nn++ )
    {
        AF_Width width = axis->widths + nn;


        width->cur = FT_MulFix( width->org, scale );
        width->fit = width->cur;
    }

    /* an extra-light axis corresponds to a standard width that is */
    /* smaller than 5/8 pixels                                     */
    axis->extra_light =
            ( FT_Bool )( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );

    if ( dim == AF_DIMENSION_VERT )
    {
        /* scale the blue zones */
        for ( nn = 0; nn < axis->blue_count; nn++ )
        {
            AF_LatinBlue blue = &axis->blues[ nn ];
            FT_Pos dist;


            blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
            blue->ref.fit = blue->ref.cur;
            blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
            blue->shoot.fit = blue->shoot.cur;
            blue->flags &= ~AF_LATIN_BLUE_ACTIVE;

            /* a blue zone is only active if it is less than 3/4 pixels tall */
            dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
            if ( dist <= 48 && dist >= -48 )
            {
                FT_Pos delta1, delta2;

                delta1 = blue->shoot.org - blue->ref.org;
                delta2 = delta1;
                if ( delta1 < 0 )
                {
                    delta2 = -delta2;
                }

                delta2 = FT_MulFix( delta2, scale );

                if ( delta2 < 32 )
                {
                    delta2 = 0;
                }
                else if ( delta2 < 64 )
                {
                    delta2 = 32 + ((( delta2 - 32 ) + 16 ) & ~31 );
                }
                else
                {
                    delta2 = FT_PIX_ROUND( delta2 );
                }

                if ( delta1 < 0 )
                {
                    delta2 = -delta2;
                }

                blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
                blue->shoot.fit = blue->ref.fit + delta2;

                FT_TRACE5(( ">> activating blue zone %d:"
                            "  ref.cur=%.2g ref.fit=%.2g"
                            "  shoot.cur=%.2g shoot.fit=%.2g\n",
                        nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0,
                        blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 ));

                blue->flags |= AF_LATIN_BLUE_ACTIVE;
            }
        }
    }
}


FT_LOCAL_DEF( void )

af_latin2_metrics_scale( AF_LatinMetrics

metrics,

AF_Scaler scaler

)
{
metrics->root.scaler.

render_mode = scaler->render_mode;

metrics->root.scaler.

face = scaler->face;

metrics->root.scaler.

flags = scaler->flags;

af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ

);

af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT

);
}


/*************************************************************************/
/*************************************************************************/
/*****                                                               *****/
/*****           L A T I N   G L Y P H   A N A L Y S I S             *****/
/*****                                                               *****/
/*************************************************************************/
/*************************************************************************/

#define  SORT_SEGMENTS

FT_LOCAL_DEF( FT_Error )

af_latin2_hints_compute_segments( AF_GlyphHints

hints,

AF_Dimension dim

)
{
AF_AxisHints axis = &hints->axis[ dim ];

FT_Memory memory = hints->memory;

FT_Error error = AF_Err_Ok;

AF_Segment segment = NULL;

AF_SegmentRec seg0;

AF_Point *contour = hints->contours;

AF_Point *contour_limit = contour + hints->num_contours;

AF_Direction major_dir, segment_dir;


FT_ZERO( &seg0 );
seg0.

score = 32000;

seg0.

flags = AF_EDGE_NORMAL;

major_dir = ( AF_Direction ) FT_ABS( axis->major_dir );

segment_dir = major_dir;

axis->

num_segments = 0;

/* set up (u,v) in each point */
if ( dim == AF_DIMENSION_HORZ )
{
AF_Point point = hints->points;

AF_Point limit = point + hints->num_points;


for (;

point <limit;

point++ )
{
point->

u = point->fx;

point->

v = point->fy;

}
}
else
{
AF_Point point = hints->points;

AF_Point limit = point + hints->num_points;


for (;

point <limit;

point++ )
{
point->

u = point->fy;

point->

v = point->fx;

}
}

/* do each contour separately */
for (;

contour <contour_limit;

contour++ )
{
AF_Point point = contour[ 0 ];

AF_Point start = point;

AF_Point last = point->prev;


if ( point == last )  /* skip singletons -- just in case */
continue;

/* already on an edge ?, backtrack to find its start */
if (

FT_ABS( point

->in_dir ) == major_dir )
{
point = point->prev;

while ( point->in_dir == start->in_dir )

point = point->prev;

}
else  /* otherwise, find first segment start, if any */
{
while (

FT_ABS( point

->out_dir ) != major_dir )
{
point = point->next;

if ( point == start )
goto

NextContour;

}
}

start = point;

for  (;;)
{
AF_Point first;

FT_Pos min_u, min_v, max_u, max_v;

/* we're at the start of a new segment */
FT_ASSERT ( FT_ABS( point

->out_dir ) == major_dir &&
point->in_dir != point->out_dir );

first = point;

min_u = max_u = point->u;

min_v = max_v = point->v;

point = point->next;

while ( point->out_dir == first->out_dir )
{
point = point->next;

if ( point->u < min_u )

min_u = point->u;

if ( point->u > max_u )

max_u = point->u;

}

if ( point->v < min_v )

min_v = point->v;

if ( point->v > max_v )

max_v = point->v;

/* record new segment */
error = af_axis_hints_new_segment( axis, memory, &segment );

if ( error )
goto

Exit;

segment[0]         =

seg0;

segment->

dir = first->out_dir;

segment->

first = first;

segment->

last = point;

segment->

pos = ( FT_Short )(( min_u + max_u ) >> 1 );

segment->

min_coord = ( FT_Short ) min_v;

segment->

max_coord = ( FT_Short ) max_v;

segment->

height = ( FT_Short )( max_v - min_v );

/* a segment is round if it doesn't have successive */
/* on-curve points.                                 */
{
AF_Point pt = first;

AF_Point last = point;

AF_Flags f0 = ( AF_Flags ) ( pt->flags & AF_FLAG_CONTROL );

AF_Flags f1;


segment->flags &= ~

AF_EDGE_ROUND;

for (; pt !=

last;

f0 = f1

)
{
pt = pt->next;

f1 = ( AF_Flags ) ( pt->flags & AF_FLAG_CONTROL );

if ( !f0 && !f1 )
break;

if ( pt == last )
segment->flags |=

AF_EDGE_ROUND;

}
}

/* this can happen in the case of a degenerate contour
 * e.g. a 2-point vertical contour
 */
if ( point == start )
break;

/* jump to the start of the next segment, if any */
while (

FT_ABS(point

->out_dir) != major_dir )
{
point = point->next;

if ( point == start )
goto

NextContour;

}
}

NextContour:;
} /* contours */

/* now slightly increase the height of segments when this makes */
/* sense -- this is used to better detect and ignore serifs     */
{
AF_Segment segments = axis->segments;

AF_Segment segments_end = segments + axis->num_segments;


for (

segment = segments;

segment <segments_end;

segment++ )
{
AF_Point first = segment->first;

AF_Point last = segment->last;

AF_Point p;

FT_Pos first_v = first->v;

FT_Pos last_v = last->v;


if ( first == last )
continue;

if ( first_v < last_v )
{
p = first->prev;

if ( p->v < first_v )
segment->

height = ( FT_Short )( segment->height +
                       (( first_v - p->v ) >> 1 ));

p = last->next;

if ( p->v > last_v )
segment->

height = ( FT_Short )( segment->height +
                       (( p->v - last_v ) >> 1 ));

}
else
{
p = first->prev;

if ( p->v > first_v )
segment->

height = ( FT_Short )( segment->height +
                       (( p->v - first_v ) >> 1 ));

p = last->next;

if ( p->v < last_v )
segment->

height = ( FT_Short )( segment->height +
                       (( last_v - p->v ) >> 1 ));

}
}
}

#ifdef AF_SORT_SEGMENTS
/* place all segments with a negative direction to the start
 * of the array, used to speed up segment linking later...
 */
 {
   AF_Segment  segments = axis->segments;
   FT_UInt     count    = axis->num_segments;
   FT_UInt     ii, jj;

   for (ii = 0; ii < count; ii++)
   {
     if ( segments[ii].dir > 0 )
     {
       for (jj = ii+1; jj < count; jj++)
       {
         if ( segments[jj].dir < 0 )
         {
           AF_SegmentRec  tmp;

           tmp          = segments[ii];
           segments[ii] = segments[jj];
           segments[jj] = tmp;

           break;
         }
       }

       if ( jj == count )
         break;
     }
   }
   axis->mid_segments = ii;
 }
#endif

Exit:
return

error;

}


FT_LOCAL_DEF( void )

af_latin2_hints_link_segments( AF_GlyphHints

hints,

AF_Dimension dim

)
{
AF_AxisHints axis = &hints->axis[ dim ];

AF_Segment segments = axis->segments;

AF_Segment segment_limit = segments + axis->num_segments;

#ifdef AF_SORT_SEGMENTS
AF_Segment    segment_mid   = segments + axis->mid_segments;
#endif

FT_Pos len_threshold, len_score;

AF_Segment seg1, seg2;


len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );

if ( len_threshold == 0 )

len_threshold = 1;

len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );

#ifdef AF_SORT_SEGMENTS
for ( seg1 = segments; seg1 < segment_mid; seg1++ )
{
  if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
    continue;

  for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ )
#else
/* now compare each segment to the others */
for (

seg1 = segments;

seg1 <segment_limit;

seg1++ )
{
/* the fake segments are introduced to hint the metrics -- */
/* we must never link them to anything                     */
if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
continue;

for (

seg2 = segments;

seg2 <segment_limit;

seg2++ )
if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
#endif
{
FT_Pos pos1 = seg1->pos;

FT_Pos pos2 = seg2->pos;

FT_Pos dist = pos2 - pos1;


if ( dist < 0 )
continue;

{
FT_Pos min = seg1->min_coord;

FT_Pos max = seg1->max_coord;

FT_Pos len, score;


if ( min < seg2->min_coord )

min = seg2->min_coord;

if ( max > seg2->max_coord )

max = seg2->max_coord;

len = max - min;

if ( len >= len_threshold )
{
score = dist + len_score / len;

if ( score < seg1->score )
{
seg1->

score = score;

seg1->

link = seg2;

}

if ( score < seg2->score )
{
seg2->

score = score;

seg2->

link = seg1;

}
}
}
}
}
#if 0
}
#endif

/* now, compute the `serif' segments */
for (

seg1 = segments;

seg1 <segment_limit;

seg1++ )
{
seg2 = seg1->link;

if ( seg2 )
{
if ( seg2->link != seg1 )
{
seg1->

link = 0;

seg1->

serif = seg2->link;

}
}
}
}


FT_LOCAL_DEF( FT_Error )

af_latin2_hints_compute_edges( AF_GlyphHints

hints,

AF_Dimension dim

)
{
AF_AxisHints axis = &hints->axis[ dim ];

FT_Error error = AF_Err_Ok;

FT_Memory memory = hints->memory;

AF_LatinAxis laxis = &(( AF_LatinMetrics ) hints->metrics )->axis[ dim ];

AF_Segment segments = axis->segments;

AF_Segment segment_limit = segments + axis->num_segments;

AF_Segment seg;

AF_Direction up_dir;

FT_Fixed scale;

FT_Pos edge_distance_threshold;

FT_Pos segment_length_threshold;


axis->

num_edges = 0;

scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
                                     : hints->y_scale;

up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
                                      : AF_DIR_RIGHT;

/*
 *  We want to ignore very small (mostly serif) segments, we do that
 *  by ignoring those that whose length is less than a given fraction
 *  of the standard width. If there is no standard width, we ignore
 *  those that are less than a given size in pixels
 *
 *  also, unlink serif segments that are linked to segments farther
 *  than 50% of the standard width
 */
if ( dim == AF_DIMENSION_HORZ )
{
if ( laxis->width_count > 0 )

segment_length_threshold = ( laxis->standard_width * 10 ) >> 4;

else

segment_length_threshold = FT_DivFix( 64, hints->y_scale );

}
else

segment_length_threshold = 0;

/*********************************************************************/
/*                                                                   */
/* We will begin by generating a sorted table of edges for the       */
/* current direction.  To do so, we simply scan each segment and try */
/* to find an edge in our table that corresponds to its position.    */
/*                                                                   */
/* If no edge is found, we create and insert a new edge in the       */
/* sorted table.  Otherwise, we simply add the segment to the edge's */
/* list which will be processed in the second step to compute the    */
/* edge's properties.                                                */
/*                                                                   */
/* Note that the edges table is sorted along the segment/edge        */
/* position.                                                         */
/*                                                                   */
/*********************************************************************/

edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
                                     scale );

if ( edge_distance_threshold > 64 / 4 )

edge_distance_threshold = 64 / 4;

edge_distance_threshold = FT_DivFix( edge_distance_threshold,
                                     scale );

for (

seg = segments;

seg <segment_limit;

seg++ )
{
AF_Edge found = 0;

FT_Int ee;


if ( seg->height < segment_length_threshold )
continue;

/* A special case for serif edges: If they are smaller than */
/* 1.5 pixels we ignore them.                               */
if ( seg->serif )
{
FT_Pos dist = seg->serif->pos - seg->pos;

if (dist < 0)

dist = -dist;

if (dist >= laxis->standard_width >> 1)
{
/* unlink this serif, it is too distant from its reference stem */
seg->

serif = NULL;

}
else if ( 2*seg->height < 3 * segment_length_threshold )
continue;
}

/* look for an edge corresponding to the segment */
for (

ee = 0;

ee < axis->

num_edges;

ee++ )
{
AF_Edge edge = axis->edges + ee;

FT_Pos dist;


dist = seg->pos - edge->fpos;

if ( dist < 0 )

dist = -dist;

if ( dist < edge_distance_threshold && edge->dir == seg->dir )
{
found = edge;

break;
}
}

if ( !found )
{
AF_Edge edge;


/* insert a new edge in the list and */
/* sort according to the position    */
error = af_axis_hints_new_edge( axis, seg->pos, seg->dir,
                                memory, &edge );

if ( error )
goto

Exit;

/* add the segment to the new edge's list */
FT_ZERO( edge );

edge->

first = seg;

edge->

last = seg;

edge->

fpos = seg->pos;

edge->

dir = seg->dir;

edge->

opos = edge->pos = FT_MulFix( seg->pos, scale );

seg->

edge_next = seg;

}
else
{
/* if an edge was found, simply add the segment to the edge's */
/* list                                                       */
seg->

edge_next = found->first;

found->last->

edge_next = seg;

found->

last = seg;

}
}


/*********************************************************************/
/*                                                                   */
/* Good, we will now compute each edge's properties according to     */
/* segments found on its position.  Basically, these are:            */
/*                                                                   */
/*  - edge's main direction                                          */
/*  - stem edge, serif edge or both (which defaults to stem then)    */
/*  - rounded edge, straight or both (which defaults to straight)    */
/*  - link for edge                                                  */
/*                                                                   */
/*********************************************************************/

/* first of all, set the `edge' field in each segment -- this is */
/* required in order to compute edge links                       */

/*
 * Note that removing this loop and setting the `edge' field of each
 * segment directly in the code above slows down execution speed for
 * some reasons on platforms like the Sun.
 */
{
AF_Edge edges = axis->edges;

AF_Edge edge_limit = edges + axis->num_edges;

AF_Edge edge;


for (

edge = edges;

edge <edge_limit;

edge++ )
{
seg = edge->first;

if ( seg )
do
{
seg->

edge = edge;

seg = seg->edge_next;

} while ( seg != edge->first );
}

/* now, compute each edge properties */
for (

edge = edges;

edge <edge_limit;

edge++ )
{
FT_Int is_round = 0;  /* does it contain round segments?    */
FT_Int is_straight = 0;  /* does it contain straight segments? */
#if 0
FT_Pos  ups         = 0;  /* number of upwards segments         */
FT_Pos  downs       = 0;  /* number of downwards segments       */
#endif


seg = edge->first;

do
{
FT_Bool is_serif;


/* check for roundness of segment */
if ( seg->flags & AF_EDGE_ROUND )
is_round++;
else
is_straight++;

#if 0
/* check for segment direction */
if ( seg->dir == up_dir )
  ups   += seg->max_coord-seg->min_coord;
else
  downs += seg->max_coord-seg->min_coord;
#endif

/* check for links -- if seg->serif is set, then seg->link must */
/* be ignored                                                   */
is_serif = ( FT_Bool )( seg->serif &&
                        seg->serif->edge &&
                        seg->serif->edge != edge );

if (( seg->link && seg->link->edge != NULL ) || is_serif )
{
AF_Edge edge2;

AF_Segment seg2;


edge2 = edge->link;

seg2 = seg->link;

if ( is_serif )
{
seg2 = seg->serif;

edge2 = edge->serif;

}

if ( edge2 )
{
FT_Pos edge_delta;

FT_Pos seg_delta;


edge_delta = edge->fpos - edge2->fpos;

if ( edge_delta < 0 )

edge_delta = -edge_delta;

seg_delta = seg->pos - seg2->pos;

if ( seg_delta < 0 )

seg_delta = -seg_delta;

if ( seg_delta < edge_delta )

edge2 = seg2->edge;

}
else

edge2 = seg2->edge;

if ( is_serif )
{
edge->

serif = edge2;

edge2->flags |=

AF_EDGE_SERIF;

}
else
edge->

link = edge2;

}

seg = seg->edge_next;

} while ( seg != edge->first );

/* set the round/straight flags */
edge->

flags = AF_EDGE_NORMAL;

if ( is_round > 0 && is_round >= is_straight )
edge->flags |=

AF_EDGE_ROUND;

#if 0
/* set the edge's main direction */
edge->dir = AF_DIR_NONE;

if ( ups > downs )
  edge->dir = (FT_Char)up_dir;

else if ( ups < downs )
  edge->dir = (FT_Char)-up_dir;

else if ( ups == downs )
  edge->dir = 0;  /* both up and down! */
#endif

/* gets rid of serifs if link is set                */
/* XXX: This gets rid of many unpleasant artefacts! */
/*      Example: the `c' in cour.pfa at size 13     */

if ( edge->serif && edge->link )
edge->

serif = 0;

}
}

Exit:
return

error;

}


FT_LOCAL_DEF( FT_Error )

af_latin2_hints_detect_features( AF_GlyphHints

hints,

AF_Dimension dim

)
{
FT_Error error;


error = af_latin2_hints_compute_segments( hints, dim );

if ( !error )
{
af_latin2_hints_link_segments( hints, dim

);

error = af_latin2_hints_compute_edges( hints, dim );

}
return

error;

}


FT_LOCAL_DEF( void )

af_latin2_hints_compute_blue_edges( AF_GlyphHints

hints,

AF_LatinMetrics metrics

)
{
AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ];

AF_Edge edge = axis->edges;

AF_Edge edge_limit = edge + axis->num_edges;

AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ];

FT_Fixed scale = latin->scale;

FT_Pos best_dist0;  /* initial threshold */


/* compute the initial threshold as a fraction of the EM size */
best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );

if ( best_dist0 > 64 / 2 )

best_dist0 = 64 / 2;

/* compute which blue zones are active, i.e. have their scaled */
/* size < 3/4 pixels                                           */

/* for each horizontal edge search the blue zone which is closest */
for (;

edge <edge_limit;

edge++ )
{
FT_Int bb;

AF_Width best_blue = NULL;

FT_Pos best_dist = best_dist0;

for (

bb = 0;

bb <AF_LATIN_BLUE_MAX;

bb++ )
{
AF_LatinBlue blue = latin->blues + bb;

FT_Bool is_top_blue, is_major_dir;


/* skip inactive blue zones (i.e., those that are too small) */
if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ))
continue;

/* if it is a top zone, check for right edges -- if it is a bottom */
/* zone, check for left edges                                      */
/*                                                                 */
/* of course, that's for TrueType                                  */
is_top_blue = ( FT_Byte )(( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );

is_major_dir = FT_BOOL( edge->dir == axis->major_dir );

/* if it is a top zone, the edge must be against the major    */
/* direction; if it is a bottom zone, it must be in the major */
/* direction                                                  */
if (

is_top_blue ^is_major_dir

)
{
FT_Pos dist;

AF_Width compare;


/* if it's a rounded edge, compare it to the overshoot position */
/* if it's a flat edge, compare it to the reference position    */
if ( edge->flags & AF_EDGE_ROUND )

compare = &blue->shoot;

else

compare = &blue->ref;

dist = edge->fpos - compare->org;

if (dist < 0)

dist = -dist;

dist = FT_MulFix( dist, scale );

if ( dist < best_dist )
{
best_dist = dist;

best_blue = compare;

}

#if 0
/* now, compare it to the overshoot position if the edge is     */
/* rounded, and if the edge is over the reference position of a */
/* top zone, or under the reference position of a bottom zone   */
if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
{
  FT_Bool  is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );


  if ( is_top_blue ^ is_under_ref )
  {
    blue = latin->blues + bb;
    dist = edge->fpos - blue->shoot.org;
    if ( dist < 0 )
      dist = -dist;

    dist = FT_MulFix( dist, scale );
    if ( dist < best_dist )
    {
      best_dist = dist;
      best_blue = & blue->shoot;
    }
  }
}
#endif
}
}

if ( best_blue )
edge->

blue_edge = best_blue;

}
}


static FT_Error
af_latin2_hints_init( AF_GlyphHints hints,
                      AF_LatinMetrics metrics )
{
    FT_Render_Mode mode;
    FT_UInt32 scaler_flags, other_flags;
    FT_Face face = metrics->root.scaler.face;


    af_glyph_hints_rescale( hints, ( AF_ScriptMetrics ) metrics );

    /*
     *  correct x_scale and y_scale if needed, since they may have
     *  been modified `af_latin2_metrics_scale_dim' above
     */
    hints->x_scale = metrics->axis[ AF_DIMENSION_HORZ ].scale;
    hints->x_delta = metrics->axis[ AF_DIMENSION_HORZ ].delta;
    hints->y_scale = metrics->axis[ AF_DIMENSION_VERT ].scale;
    hints->y_delta = metrics->axis[ AF_DIMENSION_VERT ].delta;

    /* compute flags depending on render mode, etc. */
    mode = metrics->root.scaler.render_mode;

#if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */
    if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
    {
      metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
    }
#endif

    scaler_flags = hints->scaler_flags;
    other_flags = 0;

    /*
     *  We snap the width of vertical stems for the monochrome and
     *  horizontal LCD rendering targets only.
     */
    if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
    {
        other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
    }

    /*
     *  We snap the width of horizontal stems for the monochrome and
     *  vertical LCD rendering targets only.
     */
    if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
    {
        other_flags |= AF_LATIN_HINTS_VERT_SNAP;
    }

    /*
     *  We adjust stems to full pixels only if we don't use the `light' mode.
     */
    if ( mode != FT_RENDER_MODE_LIGHT )
    {
        other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
    }

    if ( mode == FT_RENDER_MODE_MONO )
    {
        other_flags |= AF_LATIN_HINTS_MONO;
    }

    /*
     *  In `light' hinting mode we disable horizontal hinting completely.
     *  We also do it if the face is italic.
     */
    if ( mode == FT_RENDER_MODE_LIGHT ||
         ( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 )
    {
        scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
    }

    hints->scaler_flags = scaler_flags;
    hints->other_flags = other_flags;

    return 0;
}


/*************************************************************************/
/*************************************************************************/
/*****                                                               *****/
/*****        L A T I N   G L Y P H   G R I D - F I T T I N G        *****/
/*****                                                               *****/
/*************************************************************************/
/*************************************************************************/

/* snap a given width in scaled coordinates to one of the */
/* current standard widths                                */

static FT_Pos
af_latin2_snap_width( AF_Width widths,
                      FT_Int count,
                      FT_Pos width )
{
    int n;
    FT_Pos best = 64 + 32 + 2;
    FT_Pos reference = width;
    FT_Pos scaled;


    for ( n = 0; n < count; n++ )
    {
        FT_Pos w;
        FT_Pos dist;


        w = widths[ n ].cur;
        dist = width - w;
        if ( dist < 0 )
        {
            dist = -dist;
        }
        if ( dist < best )
        {
            best = dist;
            reference = w;
        }
    }

    scaled = FT_PIX_ROUND( reference );

    if ( width >= reference )
    {
        if ( width < scaled + 48 )
        {
            width = reference;
        }
    }
    else
    {
        if ( width > scaled - 48 )
        {
            width = reference;
        }
    }

    return width;
}


/* compute the snapped width of a given stem */

static FT_Pos
af_latin2_compute_stem_width( AF_GlyphHints hints,
                              AF_Dimension dim,
                              FT_Pos width,
                              AF_Edge_Flags base_flags,
                              AF_Edge_Flags stem_flags )
{
    AF_LatinMetrics metrics = ( AF_LatinMetrics ) hints->metrics;
    AF_LatinAxis axis = &metrics->axis[ dim ];
    FT_Pos dist = width;
    FT_Int sign = 0;
    FT_Int vertical = ( dim == AF_DIMENSION_VERT );


    FT_UNUSED( base_flags );

    if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
         axis->extra_light )
    {
        return width;
    }

    if ( dist < 0 )
    {
        dist = -width;
        sign = 1;
    }

    if (( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints )) ||
        ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints )))
    {
        /* smooth hinting process: very lightly quantize the stem width */

        /* leave the widths of serifs alone */

        if (( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ))
        {
            goto Done_Width;
        }

#if 0
        else if ( ( base_flags & AF_EDGE_ROUND ) )
        {
          if ( dist < 80 )
            dist = 64;
        }
        else if ( dist < 56 )
          dist = 56;
#endif
        if ( axis->width_count > 0 )
        {
            FT_Pos delta;


            /* compare to standard width */
            if ( axis->width_count > 0 )
            {
                delta = dist - axis->widths[ 0 ].cur;

                if ( delta < 0 )
                {
                    delta = -delta;
                }

                if ( delta < 40 )
                {
                    dist = axis->widths[ 0 ].cur;
                    if ( dist < 48 )
                    {
                        dist = 48;
                    }

                    goto Done_Width;
                }
            }

            if ( dist < 3 * 64 )
            {
                delta = dist & 63;
                dist &= -64;

                if ( delta < 10 )
                {
                    dist += delta;
                }

                else if ( delta < 32 )
                {
                    dist += 10;
                }

                else if ( delta < 54 )
                {
                    dist += 54;
                }

                else
                {
                    dist += delta;
                }
            }
            else
            {
                dist = ( dist + 32 ) & ~63;
            }
        }
    }
    else
    {
        /* strong hinting process: snap the stem width to integer pixels */
        FT_Pos org_dist = dist;


        dist = af_latin2_snap_width( axis->widths, axis->width_count, dist );

        if ( vertical )
        {
            /* in the case of vertical hinting, always round */
            /* the stem heights to integer pixels            */

            if ( dist >= 64 )
            {
                dist = ( dist + 16 ) & ~63;
            }
            else
            {
                dist = 64;
            }
        }
        else
        {
            if ( AF_LATIN_HINTS_DO_MONO( hints ))
            {
                /* monochrome horizontal hinting: snap widths to integer pixels */
                /* with a different threshold                                   */

                if ( dist < 64 )
                {
                    dist = 64;
                }
                else
                {
                    dist = ( dist + 32 ) & ~63;
                }
            }
            else
            {
                /* for horizontal anti-aliased hinting, we adopt a more subtle */
                /* approach: we strengthen small stems, round stems whose size */
                /* is between 1 and 2 pixels to an integer, otherwise nothing  */

                if ( dist < 48 )
                {
                    dist = ( dist + 64 ) >> 1;
                }

                else if ( dist < 128 )
                {
                    /* We only round to an integer width if the corresponding */
                    /* distortion is less than 1/4 pixel.  Otherwise this     */
                    /* makes everything worse since the diagonals, which are  */
                    /* not hinted, appear a lot bolder or thinner than the    */
                    /* vertical stems.                                        */

                    FT_Int delta;


                    dist = ( dist + 22 ) & ~63;
                    delta = dist - org_dist;
                    if ( delta < 0 )
                    {
                        delta = -delta;
                    }

                    if ( delta >= 16 )
                    {
                        dist = org_dist;
                        if ( dist < 48 )
                        {
                            dist = ( dist + 64 ) >> 1;
                        }
                    }
                }
                else
                {
                    /* round otherwise to prevent color fringes in LCD mode */
                    dist = ( dist + 32 ) & ~63;
                }
            }
        }
    }

    Done_Width:
    if ( sign )
    {
        dist = -dist;
    }

    return dist;
}


/* align one stem edge relative to the previous stem edge */

static void
af_latin2_align_linked_edge( AF_GlyphHints hints,
                             AF_Dimension dim,
                             AF_Edge base_edge,
                             AF_Edge stem_edge )
{
    FT_Pos dist = stem_edge->opos - base_edge->opos;

    FT_Pos fitted_width = af_latin2_compute_stem_width(
            hints, dim, dist,
            ( AF_Edge_Flags ) base_edge->flags,
            ( AF_Edge_Flags ) stem_edge->flags );


    stem_edge->pos = base_edge->pos + fitted_width;

    FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "
                "dist was %.2f, now %.2f\n",
            stem_edge - hints->axis[ dim ].edges, stem_edge->opos / 64.0,
            stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));
}


static void
af_latin2_align_serif_edge( AF_GlyphHints hints,
                            AF_Edge base,
                            AF_Edge serif )
{
    FT_UNUSED( hints );

    serif->pos = base->pos + ( serif->opos - base->opos );
}


/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/****                                                                 ****/
/****                    E D G E   H I N T I N G                      ****/
/****                                                                 ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/


FT_LOCAL_DEF( void )

af_latin2_hint_edges( AF_GlyphHints

hints,

AF_Dimension dim

)
{
AF_AxisHints axis = &hints->axis[ dim ];

AF_Edge edges = axis->edges;

AF_Edge edge_limit = edges + axis->num_edges;

AF_Edge edge;

AF_Edge anchor = 0;

FT_Int has_serifs = 0;

FT_Pos anchor_drift = 0;


FT_TRACE5(( "==== hinting %s edges =====\n",
dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));

/* we begin by aligning all stems relative to the blue zone */
/* if needed -- that's only for horizontal edges            */

if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) )
{
for (

edge = edges;

edge <edge_limit;

edge++ )
{
AF_Width blue;

AF_Edge edge1, edge2;


if ( edge->flags & AF_EDGE_DONE )
continue;

blue = edge->blue_edge;

edge1 = NULL;

edge2 = edge->link;

if ( blue )
{
edge1 = edge;

}
else if ( edge2 && edge2->blue_edge )
{
blue = edge2->blue_edge;

edge1 = edge2;

edge2 = edge;

}

if ( !edge1 )
continue;

FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "
"was (%.2f)\n",
edge1-edges, edge1->opos / 64.0, blue->fit / 64.0,
edge1->pos / 64.0 ));

edge1->

pos = blue->fit;

edge1->flags |=

AF_EDGE_DONE;

if ( edge2 && !edge2->blue_edge )
{
af_latin2_align_linked_edge( hints, dim, edge1, edge2

);
edge2->flags |=

AF_EDGE_DONE;

}

if ( !anchor )
{
anchor = edge;

anchor_drift = ( anchor->pos - anchor->opos );

if (edge2)

anchor_drift = ( anchor_drift + ( edge2->pos - edge2->opos )) >> 1;

}
}
}

/* now we will align all stem edges, trying to maintain the */
/* relative order of stems in the glyph                     */
for (

edge = edges;

edge <edge_limit;

edge++ )
{
AF_Edge edge2;


if ( edge->flags & AF_EDGE_DONE )
continue;

/* skip all non-stem edges */
edge2 = edge->link;

if ( !edge2 )
{
has_serifs++;
continue;
}

/* now align the stem */

/* this should not happen, but it's better to be safe */
if ( edge2->blue_edge )
{
FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges ));

af_latin2_align_linked_edge( hints, dim, edge2, edge

);
edge->flags |=

AF_EDGE_DONE;

continue;
}

if ( !anchor )
{
FT_Pos org_len, org_center, cur_len;

FT_Pos cur_pos1, error1, error2, u_off, d_off;


org_len = edge2->opos - edge->opos;

cur_len = af_latin2_compute_stem_width(
        hints, dim, org_len,
        ( AF_Edge_Flags ) edge->flags,
        ( AF_Edge_Flags ) edge2->flags );

if ( cur_len <= 64 )

u_off = d_off = 32;

else
{
u_off = 38;

d_off = 26;

}

if ( cur_len < 96 )
{
org_center = edge->opos + ( org_len >> 1 );

cur_pos1 = FT_PIX_ROUND( org_center );

error1 = org_center - ( cur_pos1 - u_off );

if ( error1 < 0 )

error1 = -error1;

error2 = org_center - ( cur_pos1 + d_off );

if ( error2 < 0 )

error2 = -error2;

if ( error1 < error2 )
cur_pos1 -=

u_off;

else
cur_pos1 +=

d_off;

edge->

pos = cur_pos1 - cur_len / 2;

edge2->

pos = edge->pos + cur_len;

}
else
edge->

pos = FT_PIX_ROUND( edge->opos );

FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)"
" snapped to (%.2f) (%.2f)\n",
edge-edges, edge->opos / 64.0,
edge2-edges, edge2->opos / 64.0,
edge->pos / 64.0, edge2->pos / 64.0 ));

anchor = edge;

edge->flags |=

AF_EDGE_DONE;

af_latin2_align_linked_edge( hints, dim, edge, edge2

);

edge2->flags |=

AF_EDGE_DONE;

anchor_drift = (( anchor->pos - anchor->opos ) +
                ( edge2->pos - edge2->opos )) >> 1;

FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 ));
}
else
{
FT_Pos org_pos, org_len, org_center, cur_center, cur_len;

FT_Pos org_left, org_right;


org_pos = edge->opos + anchor_drift;

org_len = edge2->opos - edge->opos;

org_center = org_pos + ( org_len >> 1 );

cur_len = af_latin2_compute_stem_width(
        hints, dim, org_len,
        ( AF_Edge_Flags ) edge->flags,
        ( AF_Edge_Flags ) edge2->flags );

org_left = org_pos + (( org_len - cur_len ) >> 1 );

org_right = org_pos + (( org_len + cur_len ) >> 1 );

FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ",
org_left / 64.0, org_right / 64.0 ));

cur_center = org_center;

if ( edge2->flags & AF_EDGE_DONE )
{
FT_TRACE5(( "\n" ));
edge->

pos = edge2->pos - cur_len;

}
else
{
/* we want to compare several displacement, and choose
 * the one that increases fitness while minimizing
 * distortion as well
 */
FT_Pos displacements[6], scores[6], org, fit, delta;

FT_UInt count = 0;

/* note: don't even try to fit tiny stems */
if ( cur_len < 32 )
{
FT_TRACE5(( "tiny stem\n" ));
goto

AlignStem;

}

/* if the span is within a single pixel, don't touch it */
if (

FT_PIX_FLOOR(org_left)

==

FT_PIX_CEIL(org_right)

)
{
FT_TRACE5(( "single pixel stem\n" ));
goto

AlignStem;

}

if (cur_len <= 96)
{
/* we want to avoid the absolute worst case which is
 * when the left and right edges of the span each represent
 * about 50% of the gray. we'd better want to change this
 * to 25/75%, since this is much more pleasant to the eye with
 * very acceptable distortion
 */
FT_Pos frac_left = ( org_left ) & 63;

FT_Pos frac_right = ( org_right ) & 63;

if ( frac_left  >= 22 && frac_left  <= 42 &&
frac_right >= 22 && frac_right <= 42 )
{
org = frac_left;

fit = ( org <= 32 ) ? 16 : 48;

delta = FT_ABS( fit - org );

displacements[count] = fit -

org;

scores[count++]      =

delta;

FT_TRACE5(( "dispA=%.2f (%d) ", (fit - org) / 64.0, delta ));

org = frac_right;

fit = ( org <= 32 ) ? 16 : 48;

delta = FT_ABS( fit - org );

displacements[count] = fit -

org;

scores[count++]     =

delta;

FT_TRACE5(( "dispB=%.2f (%d) ", (fit - org) / 64.0, delta ));
}
}

/* snapping the left edge to the grid */
org = org_left;

fit = FT_PIX_ROUND( org );

delta = FT_ABS( fit - org );

displacements[count] = fit -

org;

scores[count++]      =

delta;

FT_TRACE5(( "dispC=%.2f (%d) ", (fit - org) / 64.0, delta ));

/* snapping the right edge to the grid */
org = org_right;

fit = FT_PIX_ROUND( org );

delta = FT_ABS( fit - org );

displacements[count] = fit -

org;

scores[count++]      =

delta;

FT_TRACE5(( "dispD=%.2f (%d) ", (fit - org) / 64.0, delta ));

/* now find the best displacement */
{
FT_Pos best_score = scores[ 0 ];

FT_Pos best_disp = displacements[ 0 ];

FT_UInt nn;

for (

nn = 1;

nn <count;

nn++)
{
if (scores[nn] < best_score)
{
best_score = scores[ nn ];

best_disp = displacements[ nn ];

}
}

cur_center = org_center + best_disp;

}
FT_TRACE5(( "\n" ));
}

AlignStem:
edge->

pos = cur_center - ( cur_len >> 1 );

edge2->

pos = edge->pos + cur_len;

FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)"
" snapped to (%.2f) and (%.2f),"
" org_len=%.2f cur_len=%.2f\n",
edge-edges, edge->opos / 64.0,
edge2-edges, edge2->opos / 64.0,
edge->pos / 64.0, edge2->pos / 64.0,
org_len / 64.0, cur_len / 64.0 ));

edge->flags  |=

AF_EDGE_DONE;

edge2->flags |=

AF_EDGE_DONE;

if ( edge > edges && edge->pos < edge[-1].pos )
{
FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n",
edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));
edge->

pos = edge[ -1 ].pos;

}
}
}

/* make sure that lowercase m's maintain their symmetry */

/* In general, lowercase m's have six vertical edges if they are sans */
/* serif, or twelve if they are with serifs.  This implementation is  */
/* based on that assumption, and seems to work very well with most    */
/* faces.  However, if for a certain face this assumption is not      */
/* true, the m is just rendered like before.  In addition, any stem   */
/* correction will only be applied to symmetrical glyphs (even if the */
/* glyph is not an m), so the potential for unwanted distortion is    */
/* relatively low.                                                    */

/* We don't handle horizontal edges since we can't easily assure that */
/* the third (lowest) stem aligns with the base line; it might end up */
/* one pixel higher or lower.                                         */

#if 0
{
  FT_Int  n_edges = edge_limit - edges;


  if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
  {
    AF_Edge  edge1, edge2, edge3;
    FT_Pos   dist1, dist2, span, delta;


    if ( n_edges == 6 )
    {
      edge1 = edges;
      edge2 = edges + 2;
      edge3 = edges + 4;
    }
    else
    {
      edge1 = edges + 1;
      edge2 = edges + 5;
      edge3 = edges + 9;
    }

    dist1 = edge2->opos - edge1->opos;
    dist2 = edge3->opos - edge2->opos;

    span = dist1 - dist2;
    if ( span < 0 )
      span = -span;

    if ( span < 8 )
    {
      delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
      edge3->pos -= delta;
      if ( edge3->link )
        edge3->link->pos -= delta;

      /* move the serifs along with the stem */
      if ( n_edges == 12 )
      {
        ( edges + 8 )->pos -= delta;
        ( edges + 11 )->pos -= delta;
      }

      edge3->flags |= AF_EDGE_DONE;
      if ( edge3->link )
        edge3->link->flags |= AF_EDGE_DONE;
    }
  }
}
#endif

if ( has_serifs || !anchor )
{
/*
 *  now hint the remaining edges (serifs and single) in order
 *  to complete our processing
 */
for (

edge = edges;

edge <edge_limit;

edge++ )
{
FT_Pos delta;


if ( edge->flags & AF_EDGE_DONE )
continue;

delta = 1000;

if ( edge->serif )
{
delta = edge->serif->opos - edge->opos;

if ( delta < 0 )

delta = -delta;

}

if ( delta < 64 + 16 )
{
af_latin2_align_serif_edge( hints, edge

->serif, edge );
FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)"
" aligned to (%.2f)\n",
edge-edges, edge->opos / 64.0,
edge->serif - edges, edge->serif->opos / 64.0,
edge->pos / 64.0 ));
}
else if ( !anchor )
{
FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)"
" snapped to (%.2f)\n",
edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
edge->

pos = FT_PIX_ROUND( edge->opos );

anchor = edge;

}
else
{
AF_Edge before, after;


for (

before = edge - 1;

before >=

edges;

before-- )
if ( before->flags & AF_EDGE_DONE )
break;

for (

after = edge + 1;

after <edge_limit;

after++ )
if ( after->flags & AF_EDGE_DONE )
break;

if ( before >= edges && before < edge   &&
after < edge_limit && after > edge )
{
if ( after->opos == before->opos )
edge->

pos = before->pos;

else
edge->

pos = before->pos +
      FT_MulDiv( edge->opos - before->opos,
                 after->pos - before->pos,
                 after->opos - before->opos );

FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)"
" from %d (opos=%.2f)\n",
edge-edges, edge->opos / 64.0, edge->pos / 64.0,
before - edges, before->opos / 64.0 ));
}
else
{
edge->

pos = anchor->pos +
      (( edge->opos - anchor->opos + 16 ) & ~31 );

FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)"
" snapped to (%.2f)\n",
edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
}
}

edge->flags |=

AF_EDGE_DONE;

if ( edge > edges && edge->pos < edge[-1].pos )
edge->

pos = edge[ -1 ].pos;

if ( edge + 1 < edge_limit        &&
edge[1].flags & AF_EDGE_DONE &&
edge->pos > edge[1].pos      )
edge->

pos = edge[ 1 ].pos;

}
}
}


static FT_Error
af_latin2_hints_apply( AF_GlyphHints hints,
                       FT_Outline *outline,
                       AF_LatinMetrics metrics )
{
    FT_Error error;
    int dim;


    error = af_glyph_hints_reload( hints, outline );
    if ( error )
    {
        goto Exit;
    }

    /* analyze glyph outline */
#ifdef AF_CONFIG_OPTION_USE_WARPER
    if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ||
         AF_HINTS_DO_HORIZONTAL( hints ) )
#else
    if ( AF_HINTS_DO_HORIZONTAL( hints ))
#endif
    {
        error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ );
        if ( error )
        {
            goto Exit;
        }
    }

    if ( AF_HINTS_DO_VERTICAL( hints ))
    {
        error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT );
        if ( error )
        {
            goto Exit;
        }

        af_latin2_hints_compute_blue_edges( hints, metrics );
    }

    /* grid-fit the outline */
    for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
    {
#ifdef AF_CONFIG_OPTION_USE_WARPER
        if ( ( dim == AF_DIMENSION_HORZ &&
               metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) )
        {
          AF_WarperRec  warper;
          FT_Fixed      scale;
          FT_Pos        delta;


          af_warper_compute( &warper, hints, dim, &scale, &delta );
          af_glyph_hints_scale_dim( hints, dim, scale, delta );
          continue;
        }
#endif

        if (( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints )) ||
            ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints )))
        {
            af_latin2_hint_edges( hints, ( AF_Dimension ) dim );
            af_glyph_hints_align_edge_points( hints, ( AF_Dimension ) dim );
            af_glyph_hints_align_strong_points( hints, ( AF_Dimension ) dim );
            af_glyph_hints_align_weak_points( hints, ( AF_Dimension ) dim );
        }
    }
    af_glyph_hints_save( hints, outline );

    Exit:
    return error;
}


/*************************************************************************/
/*************************************************************************/
/*****                                                               *****/
/*****              L A T I N   S C R I P T   C L A S S              *****/
/*****                                                               *****/
/*************************************************************************/
/*************************************************************************/


static const AF_Script_UniRangeRec af_latin2_uniranges[] =
        {
                AF_UNIRANGE_REC( 32UL, 127UL ),    /* TODO: Add new Unicode ranges here! */
                AF_UNIRANGE_REC( 160UL, 255UL ),
                AF_UNIRANGE_REC( 0UL, 0UL )
        };


AF_DEFINE_SCRIPT_CLASS( af_latin2_script_class,
                        AF_SCRIPT_LATIN2,
                        af_latin2_uniranges,

                        sizeof( AF_LatinMetricsRec ),

                        ( AF_Script_InitMetricsFunc ) af_latin2_metrics_init,
                        ( AF_Script_ScaleMetricsFunc ) af_latin2_metrics_scale,
                        ( AF_Script_DoneMetricsFunc ) NULL,

                        ( AF_Script_InitHintsFunc ) af_latin2_hints_init,
                        ( AF_Script_ApplyHintsFunc ) af_latin2_hints_apply
)


/* END */
